本文選題：煤礦充填料 + 配合比　； 參考：《華北水利水電大學(xué)》2017年碩士論文

【摘要】：隨著國民經(jīng)濟的不斷發(fā)展及人類對煤炭資源需求量的增大,為了解決建筑物下面、道路下面、水體下面(簡稱“三下”)壓煤問題,煤礦開采技術(shù)也遇到了新的挑戰(zhàn)。由于傳統(tǒng)的煤礦開采技術(shù)成本高、效率低、資源浪費嚴重,且不能有效控制地表沉陷,目前國內(nèi)外發(fā)展了許多充填開采法。由于煤礦充填采用泵送技術(shù),要求充填料具有良好的流動性,初凝時間要求不低于2h,終凝時間6~8h,為了保證充填體對上覆巖層起到有效的支撐作用,確保安全有效的充填,充填體強度要滿足要求。本試驗以黃河庫區(qū)淤積超細砂、粉煤灰、42.5級普通硅酸鹽水泥以及三種外加劑為原料制備滿足要求的煤礦充填材料,研究其最佳配合比,并研究充填體的力學(xué)性能。試驗主要研究充填料基本性能的影響因素,利用正交表安排試驗,根據(jù)充填開采技術(shù)對充填料的要求,研究水泥摻量、粉煤灰摻量、料漿質(zhì)量濃度、減水劑摻量、激發(fā)劑摻量、促凝劑摻量等因素對充填料坍落度、初凝時間、終凝時間、充填體28天抗壓強度等指標的影響。通過正交試驗的結(jié)果分析,得出了6個因素對充填料三種指標的影響規(guī)律,以及各因素水平變化對三個試驗指標的影響趨勢。還對試驗結(jié)果進行了方差分析。通過充填料配合比的優(yōu)化,確定出最優(yōu)配合比為水泥摻量400kg/m3、粉煤灰摻量400kg/m3、料漿質(zhì)量濃度80%、減水劑摻量10kg/m3、激發(fā)劑摻量10kg/m3、促凝劑摻量100 kg/m3。然后利用SPSS軟件對充填料漿坍落度(x)與料漿稠度(y)之間做回歸分析,得出料漿坍落度與砂漿稠度值高度正相關(guān),相關(guān)系數(shù)為0.946,經(jīng)過線性回歸分析,得出兩個變量之間回歸方程為y=0.3x+2.877,回歸效果顯著。研究充填體抗壓強度、劈拉強度、抗折強度以及彈性模量等力學(xué)性能。進行抗壓強度(x)與彈性模量(y)的相關(guān)性分析,得出充填體抗壓強度與彈性模量之間存在高度正相關(guān)的關(guān)系。
[Abstract]:With the development of national economy and the increasing demand for coal resources, coal mining technology has met new challenges in order to solve the problem of coal compaction under buildings, roads and water bodies. Because the traditional coal mining technology has high cost, low efficiency, serious waste of resources, and can not effectively control the surface subsidence, many filling mining methods have been developed at home and abroad. Because the pumping technology is used in coal mine filling, the filling material is required to have good fluidity, the initial setting time is not less than 2 hours, and the final setting time is 6 ~ 8 hours. In order to ensure that the filling body plays an effective supporting role on the overlying strata and ensures the safe and effective filling, The strength of the filling body should meet the requirements. In this experiment, coal mine filling materials were prepared by using silt superfine sand, fly ash 42.5 grade Portland cement and three admixtures as raw materials to study the optimum mixture ratio and the mechanical properties of the filling body. The experiment mainly studies the influence factors of the basic properties of the filling material. According to the requirements of the filling mining technology, the content of cement, the amount of fly ash, the mass concentration of slurry, the amount of water reducer, the amount of activator are studied according to the requirements of backfill mining technology. The effects of coagulant content on slump, initial setting time, final setting time and 28 days compressive strength of filling material. Through the analysis of the results of orthogonal test, the influence law of six factors on the three indexes of filling material and the influence trend of each factor level on the three test indexes were obtained. The variance analysis of the test results is also carried out. Through the optimization of filling mixture ratio, the optimum mix ratio was determined as cement content 400 kg / m 3, fly ash 400 kg / m 3, slurry mass concentration 80, water reducer 10 kg / m 3, activator 10 kg / m 3, coagulant 100 kg / m 3. Then the regression analysis was made between the slump of filling slurry (x) and the consistency of slurry (y) by using SPSS software. The results showed that the slump of slurry was highly correlated with the consistency of mortar, the correlation coefficient was 0.946, and the linear regression analysis was carried out. The regression equation between the two variables is 0.3x 2.877, and the effect of regression is remarkable. The compressive strength, splitting tensile strength, flexural strength and elastic modulus were studied. The correlation between compressive strength (x) and elastic modulus (y) is analyzed and a highly positive correlation between compressive strength and elastic modulus is obtained.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD823.7

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